I am learning Flutter GetX to my own and stuck on a point. Actually I want to know why onInit method of GetX Controlled is not calling whenever I revisit that page/dialog again.
Suppose that I have dialog with a simple TextField, a Listview the TextField is used for searching the listview. When the User enters any filter key inside the text field, the listview will be filtered.
Here is the Sample Dialog:
import 'package:flutter/material.dart';
import 'package:flutter_base_sample/util/apptheme/colors/app_colors.dart';
import 'package:flutter_base_sample/util/apptheme/styles/text_styles_util.dart';
import 'package:flutter_base_sample/util/commons/app_util.dart';
import 'package:flutter_base_sample/util/widgets/alert/controllers/country_finder_alert_controller.dart';
import 'package:flutter_base_sample/util/widgets/marquee/marquee_widget.dart';
import 'package:flutter_base_sample/util/widgets/textfields/app_text_field.dart';
import 'package:get/get.dart';
class SampleDialogWidget extends StatelessWidget {
final CountryFinderAlertController controller = Get.put(CountryFinderAlertController(),permanent: true);
@override
Widget build(BuildContext context) {
return Dialog(
insetPadding: AppUtil.dialogPadding(context),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20),
),
elevation: 0.0,
backgroundColor: Colors.white,
child: dialogContent(context),
);
}
Widget dialogContent(BuildContext context) {
return Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.max,
children: [
Text(
"Hello Heading",
style: TextStyleUtil.quickSandBold(context, fontSize: 16, color: Colors.blue),
textAlign: TextAlign.center,
),
SizedBox(
height: 20,
),
Expanded(
child: SingleChildScrollView(
child: Container(
height: AppUtil.deviceHeight(context),
padding: EdgeInsetsDirectional.all(20),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text("Hello Text1"),
SizedBox(
height: 10,
),
getSearchField(context),
SizedBox(
height: 5,
),
Expanded(
child: Obx(()=> getFavoritesListView(context)),
)
],
),
),
),
),
SizedBox(
height: 20,
),
Container(
margin: EdgeInsetsDirectional.only(start: 20,end: 20),
child: ElevatedButton(
onPressed: () {},
style: ButtonStyle(
overlayColor: MaterialStateProperty.all<Color>(Colors.red),
// splashFactory: NoSplash.splashFactory,
elevation: MaterialStateProperty.all(0.5),
backgroundColor: MaterialStateProperty.resolveWith<Color>(
(Set<MaterialState> states) {
if (states.contains(MaterialState.pressed)) {
return AppColors.instance.black.withOpacity(0.1);
} else {
return Colors.blue; // Use the component's default.
}
},
),
),
child: Text(
"Hello Footer",
style: TextStyleUtil.quickSandBold(context, fontSize: 16, color: Colors.yellow),
textAlign: TextAlign.center,
),
),
)
],
);
}
Widget getFavoritesListView(BuildContext context) {
if (controller.favoritesList.length > 0) {
return ListView.separated(
shrinkWrap: true,
itemCount: controller.favoritesList.length,
itemBuilder: (BuildContext context, int index) => _topupFavoriteContent(context, index),
separatorBuilder: (context, index) {
return Divider(
indent: 15,
endIndent: 15,
);
},
);
} else {
return Center(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: [
Text(
"No Data Found!",
textAlign: TextAlign.center,
),
SizedBox(
height: 20,
),
],
),
);
}
}
Widget _topupFavoriteContent(BuildContext context, int index) {
final item = controller.favoritesList[index];
return InkWell(
onTap: () {
Get.back(result:item);
// AppUtil.pop(context: context, valueToReturn: item);
},
child: getChildItems(context, index));
}
Widget getChildItems(BuildContext context, int index) {
return Directionality(textDirection: TextDirection.ltr, child: getContactNumberAndNameHolder(context, index));
}
Widget getContactNumberAndNameHolder(BuildContext context, int index) {
final item = controller.favoritesList[index];
return Container(
padding: EdgeInsetsDirectional.only(start: 20, end: 20, top: 20, bottom: 10),
child: Column(
children: [
Row(
// crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Flexible(
child: Align(
alignment: AlignmentDirectional.centerStart,
child: Text(
item.name ?? "",
style: TextStyleUtil.quickSandBold(context, fontSize: 15, color: AppColors.instance.black),
),
),
),
SizedBox(
width: 5,
),
Container(),
Align(
alignment: AlignmentDirectional.centerEnd,
child: MarqueeWidget(
child: Text(
item.dialCode ?? "",
style: TextStyleUtil.quickSandBold(context, fontSize: 15, color: Colors.blue),
),
),
),
],
)
],
),
);
}
Widget getSearchField(
BuildContext context,
) {
return Container(
margin: EdgeInsetsDirectional.only(start: 20, end: 20, top: 20),
child: Row(
children: [
Expanded(
child: AppTextField(
onChanged: (String text) {
controller.performSearchOnForFavoriteContact(text);
},
isPasswordField: false,
keyboardType: TextInputType.text,
suffixIconClickCallBack: () {},
),
)
],
));
}
}
and here is the GetX Controller:
class CountryFinderAlertController extends GetxController {
TextEditingController countrySearchFieldEditController = TextEditingController();
RxList<CountryHelperModel> favoritesList;
RxList<CountryHelperModel> originalList;
@override
void onInit() {
super.onInit();
debugPrint("Hello222");
favoritesList = <CountryHelperModel>[].obs;
originalList = <CountryHelperModel>[].obs;
}
@override
void onReady() {
super.onReady();
debugPrint("Hello111");
originalList.addAll(JSONHelperUtil.getCountries());
addAllCountries();
}
@override
void dispose() {
super.dispose();
countrySearchFieldEditController.dispose();
}
@override
void onClose() {
super.onClose();
}
void performSearchOnForFavoriteContact(String filterKey) {
if (filterKey != null && filterKey.isNotEmpty) {
List<CountryHelperModel> filteredFavoritesList = [];
debugPrint("filterKey" filterKey);
originalList.forEach((element) {
if (element.name.toLowerCase().contains(filterKey.toLowerCase()) ||
element.countryCode.toLowerCase().contains(filterKey.toLowerCase()) ||
element.dialCode.toLowerCase().contains(filterKey.toLowerCase())) {
filteredFavoritesList.add(element);
}
});
if (filteredFavoritesList.isNotEmpty) {
favoritesList.clear();
favoritesList.addAll(filteredFavoritesList);
} else {
favoritesList.clear();
}
} else {
//reset the list
addAllCountries();
}
}
void addAllCountries() {
favoritesList.clear();
favoritesList.addAll(originalList);
}
}
So what I want is to load fresh data each time when I open this dialog. For now, if user will search for any country and close the dialog and then if reopen it the user will see the older search results.
In simple means how can GetX Controller be Reset/Destroyed or reinitialised !
Thanks in advance
CodePudding user response：
I believe it's because of ,permanent: true
Try leaving that out.
CodePudding user response：
Disposing your resources always come after disposing super resources. So change the following
@override
void dispose() {
super.dispose();
countrySearchFieldEditController.dispose();
}
with
@override
void dispose() {
countrySearchFieldEditController.dispose();
super.dispose();
}
If it still not works, please attach the binding file code as well.